My theory is boats and ships are feminine because it's often difficult to get them to do what you want them to, and the weather has a lot to do with that.I could give you some past participles to think about, but the problem is that I'll never be sure you didn't look up on the internet to get the right answer. As teachers all of us 3 (my mum, my sister and I) we've had quite a few battles with grammar books and dictionnaries at reach of course. It's very difficicult to find the right answer at times AND explain the "why this and not that"!